Low PAP-A

Hi. Really worried. Hospital rang today with some blood results after Down's syndrome test, which that is low risk, but.... my hormone level PAP-A is low. The doctor said it can cause, growth problems, high blood pressure and premature birth. Have any of you had this in pregnancy? I'm only 14 weeks and so worried, all was well at last scan though :) I now have to be scanned every 4 weeks. Please help xx